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<?php
/* --------------------------------------------------------------
   CustomerGender.inc.php 2015-01-30 gm
   Gambio GmbH
   http://www.gambio.de
   Copyright (c) 2015 Gambio GmbH
   Released under the GNU General Public License (Version 2)
   [http://www.gnu.org/licenses/gpl-2.0.html]
   --------------------------------------------------------------
*/

MainFactory::load_class('CustomerGenderInterface');

/**
 * Value Object
 *
 * Class CustomerGender
 *
 * Represents a customer gender
 *
 * @category   System
 * @package    Customer
 * @subpackage ValueObjects
 * @implements CustomerGenderInterface
 */
class CustomerGender implements CustomerGenderInterface
{
    /**
     * Customer's gender.
     * @var string
     */
    protected $gender;


    /**
     * Constructor of the class CustomerGender.
     *
     * Validates the data type and the entered values of the customer gender.
     *
     * @param string $p_gender Customer's gender.
     *
     * @throws InvalidArgumentException If $p_gender is not a string.
     * @throws UnexpectedValueException If $p_gender is not expected string "m" or "f".
     */
    public function __construct($p_gender)
    {
        if(!is_string($p_gender))
        {
            throw new InvalidArgumentException('$p_gender is not a string');
        }
        
        if(!in_array($p_gender, array('m', 'f', '')))
        {
            throw new UnexpectedValueException('$p_gender is not expected string "m" or "f"');
        }

        $this->gender = $p_gender;
    }


    /**
     * Returns the equivalent string value.
     * @return string Equivalent string value.
     */
    public function __toString()
    {
        return $this->gender;
    }
}